"My aunt is not feeling well health-wise and I don't know how much longer I have her in my life," he said.
It was more straightforward in New York as he rarely looked troubled by Fritz, who struggled to build any momentum.
"I know we have been waiting for a champion for a long time so I'm sorry I couldn't get it done this time," said Fritz.
Sinner said the title "meant so much because the last period of my career was not easy" before he became tearful and dedicated the victory to his aunt.
"It's nice I can still share these moments with her. She is an important person in my life and still is.
Sinner was ruled to bear pelo fault or negligence for the positive tests by the International Tennis Integrity Agency (ITIA), which found he had been inadvertently contaminated by his physiotherapist.
Este nosso é igualmente este ano do 4k: a SPORT TV foi este primeiro canal português a transmitir um evento desportivo, a final da Champions entre o Real Madrid e o Atlfoitico Madrid, utilizando a tecnologia do 4k, que permite aumentar em quatro vezes a habilidade da imagem. O primeiro passo em 2016 confirmou uma aposta permanente em 2017, usando este início das emissões regulares em 4k.
Refusing to dwell on the first set, Fritz improved and made the second a closer affair, losing just two points in four service games.
Just six days before the main draw got under way, it was announced he had twice tested positive 米兰体育投注网站 for low levels of a metabolite of clostebol - a steroid that can be used to build muscle mass - in March.
It comes just 19 days after it was revealed he had been cleared of any wrongdoing after twice testing positive for a banned substance in March.
A world champion cyclist has swapped the velodrome for the cramped deck of the fastest yacht in the world. Why?
Concussions in amateur sport are not linked to increased long-term risks of cognitive decline, according to a study published on Wednesday. 04 Sep
Having failed to make the most of three break point opportunities early in the third set, Fritz brought the crowd to life with two brilliant winners to break for a 4-3 lead and keep alive his hopes.
Cheered on by a home crowd packed with celebrities and sporting stars, Fritz got off to a shaky start when he dropped serve in the first game.